六级The researchers explained that the study demonstrated when we are in a novel environment the brain partly remains alert so that humans can defend themselves against any potential danger.

研究人员解释说，这项研究表明，当我们处于一种新的环境中时，大脑部分保持警觉，以便人类能够抵御任何潜在的危险。

2017年6月六级真题（第三套）阅读 Section A

六级Apple argues that it is fighting to preserve a principle that most of us who are addicted to our smartphones can defend: Weaken a single iPhone so that its contents can be viewed by the American government and you risk weakening all iPhones for any govern

苹果公司辩称，它正在努力维护一个原则，这一原则是我们大多数沉迷于智能手机的人都可以捍卫的：削弱一台iPhone，这样它的内容就可以被美国政府看到，你就有可能以任何方式削弱所有iPhone

2017年12月六级真题（第三套）阅读 Section B

六级Google defends its scanning in-copyright books by saying that the online display of in-copyright books is not for commercial use.

谷歌为其版权书籍扫描辩护称，版权书籍的在线显示并非用于商业用途。

2011年12月阅读原文

六级How did Christopher Beard defend his company’s labeling practice?

克里斯托弗·比尔德是如何为公司的标签做法辩护的？

2016年6月大学英语六级第3套真题

考研Without the ability to think critically, to defend their ideas and understand the ideas of others, they cannot fully participate in our democracy.

如果没有批判性思维、捍卫自己的想法和理解他人想法的能力，他们就无法充分参与我们的民主。

2004年全国攻读硕士学位研究生入学考试英语试题